S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer

doi:10.1086/341253

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	S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer
	Qian SB(钱声帮)1,2 ; Zhu LY(朱俐颖)1,2 ; Qian, SB (reprint author), CAS, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2002-09
卷号	142 期号:1 页码:139-143
DOI	10.1086/341253
产权排序	第1完成单位
收录类别	SCI
关键词	Binaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual (s Equulei) Stars : Variables : Other
摘要	Orbital period change of a low mass ratio (q = 0.13) Algol-type eclipsing binary, S Equulei, is presented based on the analysis of its century-long times of light minimum. Alternate period changes are discovered to superimpose on a rather rapid period increase with rate of dP/dt = +1.27 x 10(-6) days yr(-1). The alternate period changes can be explained either by the variation in the gravitational quadruple momentum via the cyclic magnetic activity of the G-type secondary or by the light-time effect via the presence of a third body. Since the third-body assumption is in good agreement with Zola's photometric solution, S Equ may be a truly triple system. The third body is rotating in an eccentric orbit (e' = 0.37) with an orbital inclination of i' - 16degrees, which is rather smaller than that of the eclipsing binary system (i = 88.degrees3). This indicates that the third body may be captured by the eclipsing pair. New accurate photometric and spectroscopic data over the next decade are very important to verify this conclusion. The rapid period increase suggests that S Equ is a low mass ratio Algol-type binary system in an active phase of mass exchange. To satisfy such a period increase, a conservative mass transfer from the less massive to the more massive components would be of the order dm/dt = 4.94 x 10(-8) M. yr(-1).
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0067-0049
URL	查看原文
归档日期	2002-10-09
WOS记录号	WOS:000177524600008
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ORBITAL PERIOD MODULATION ; CLOSE BINARIES ; MAGNETIC CYCLES ; STARS ; SYSTEMS
引用统计	被引频次：17[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5755
专题	双星与变星研究组
通讯作者	Qian, SB (reprint author), CAS, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位	1.Yunnan Observatory, National Astronomical Observatories, CAS, P.O. Box 110, 650011 Kunming, People's Republic of China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC)
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Qian SB,Zhu LY,Qian, SB . S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2002,142(1):139-143.
APA	Qian SB,Zhu LY,&Qian, SB .(2002).S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,142(1),139-143.
MLA	Qian SB,et al."S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 142.1(2002):139-143.

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